Primary Voting Age in the United States
Eighteen states currently have the voting age for Presidential primaries set at 17 if the 17-year-old will be 18 on election day. Most, if not all, of these states permit 17-year-olds to vote in all primaries, even non-Presidential ones.
Many reports are incomplete, only show primary (and not caucus) states, etc., so this map is a compilation of many conflicting reports.
In 2008, Maryland's Secretary of State tried to disenfranchise 17-year-olds. Maryland had permitted people who would be of voting age for the general election to vote in primaries for at least forty years. The attempt failed, however, because 17-year-old Sarah Boltuck and her father Richard fought with state officials to restore voting rights in primaries.
Legislation will soon be introduced in New York that would permit 17-year-olds who will be 18 by the general election to vote in Presidential primaries.